I have an iPad with a browser that blocks certain websites, including touch arcade, but if I enter the sites IP address, I am able to excess TA.
Did you try to add the adress itselt to your Filter (*.toucharcade.com or 174.36.12.168)? Usually your Hardware Firewall should be able to do the Magic for you in both Case. At least we don`t have a Problem with it at the Office where i did simple add http://www.toucharcade.com and http://forums.toucharcade.com to the Whitelist (Cisco SA540).
I just tried 174.36.12.168 (what I got when i pinged toucharcade.com in command prompt) and it took me to a page which said, "Great Success ! Apache is working on your cPanel® and WHM™ Server". so yeah, I guess it doesn't work. Sorry OP